OCZ ZS Series 650W Review

Contents

Load Testing

Test 1 (120.18W Load – Cold)

Rail	Load	Voltage	Ripple
12V	4.87A	12.18V	13.2mV
5V	5.14A	5.14V	4.8mV
3.3V	10.21A	3.37V	4.2mV
−12V	0A	−12.07A	7.0mV
5Vsb	0A	5.12A	15.2mV
AC Power	136.99W
Efficiency	87.73%
Power Factor	0.87

Test 2 (205.14W Load – Cold)

Rail	Load	Voltage	Ripple
12V	9.73A	12.16V	17.0mV
5V	10.26A	5.13V	5.0mV
3.3V	10.18A	3.36V	4.0mV
−12V	0.1A	−11.98V	17.0mV
5Vsb	1.01A	5.07V	8.8mV
AC Power	238.14W
Efficiency	86.14%
Power Factor	0.92

Test 3 (263.12W Load – Cold)

Rail	Load	Voltage	Ripple
12V	14.54A	12.12V	22.4mV
5V	10.26A	5.13V	5.8mV
3.3V	10.18A	3.36V	4.2mV
−12V	0.1A	−12.04V	20.0mV
5Vsb	1.01A	5.07V	10.0mV
AC Power	302.1W
Efficiency	87.10%
Power Factor	0.93

Test 4 (321.49W Load – Cold)

Rail	Load	Voltage	Ripple
12V	19.38A	12.11V	28.2mV
5V	10.26A	5.13V	6.6mV
3.3V	10.18A	3.36V	5.4mV
−12V	0.1A	−12.10V	24.0mV
5Vsb	1.01A	5.07V	10.8mV
AC Power	368.43W
Efficiency	87.26%
Power Factor	0.93

Test 5 (376.7W Load – Cold)

Rail	Load	Voltage	Ripple
12V	21.78A	12.10V	24.8mV
5V	15.39A	5.13V	6.6mV
3.3V	10.18A	3.36V	5.6mV
−12V	0.1A	−12.13V	24.0mV
5Vsb	1.01A	5.07V	11.4mV
AC Power	430.33W
Efficiency	87.54%
Power Factor	0.93

Test 6 (405.5W Load – Cold)

Rail	Load	Voltage	Ripple
12V	24.18A	12.09V	28.2mV
5V	15.39A	5.13V	6.8mV
3.3V	10.18A	3.36V	5.8mV
−12V	0.1A	−12.15V	24.0mV
5Vsb	1.01A	5.07V	11.8mV
AC Power	462.88%
Efficiency	87.60%
Power Factor	0.95

Test 7 (463.38W Load – Hot)

Rail	Load	Voltage	Ripple
12V	28.99A	12.08V	35.2mV
5V	15.39A	5.13V	7.0mV
3.3V	10.18A	3.36V	6.4mV
−12V	0.1A	−12.21V	29.2mV
5Vsb	1.01A	5.07V	12.0mV
AC Power	526.95W
Efficiency	87.94%
Power Factor	0.96

Test 8 (519.42W Load – Hot)

Rail	Load	Voltage	Ripple
12V	33.74A	12.05V	39.0mV
5V	15.36A	5.12V	6.4mV
3.3V	10.18A	3.36V	5.4mV
−12V	0.1A	−12.27V	31.2mV
5Vsb	1.01A	5.07V	13.8mV
AC Power	591.12W
Efficiency	87.87%
Power Factor	0.96

Test 9 (575.96W Load – Hot)

Rail	Load	Voltage	Ripple
12V	38.50A	12.03V	44.4mV
5V	15.36A	5.12V	7.0mV
3.3V	10.18A	3.36V	5.0mV
−12V	0.1A	−12.33V	34.0mV
5Vsb	1.01A	5.07V	15.6mV
AC Power	659.41W
Efficiency	87.35%
Power Factor	0.96

Test 10 (631.23W Load – Hot)

Rail	Load	Voltage	Ripple
12V	38.40A	12.00V	53.4mV
5V	20.36A	5.09V	12.8mV
3.3V	20.12A	3.32V	10.0mV
−12V	0.1A	−12.37V	42.0mV
5Vsb	1.01A	5.04V	17.4mV
AC Power	732.33W
Efficiency	86.20%
Power Factor	0.97

Test 11 (659.22W Load – Hot)

Rail	Load	Voltage	Ripple
12V	40.77A	11.99V	59.0mV
5V	20.36A	5.09V	16.8mV
3.3V	20.12A	3.32V	12.2mV
−12V	0.1A	−12.40V	43.0mV
5Vsb	1.01A	5.04V	18.8mV
AC Power	768.38W
Efficiency	85.79%
Power Factor	0.96

Overload Test (771.21W Load – Hot)

Rail	Load	Voltage	Ripple
12V	50.23A	11.96V	67.4mV
5V	20.36A	5.09V	25.0mV
3.3V	20.12A	3.32V	17.4mV
−12V	0.1A	−12.51V	48.4mV
5Vsb	1.01A	5.04V	18.2mV
AC Power	920.82W
Efficiency	83.75%
Power Factor	0.97

The performance was excellent all around. The voltage regulation may not have been perfect, but it was very good and exceeded my expectations. The 5V and 3.3V rails hardly budged between tests 2 and 9. They dropped slightly when I increased the load to 20A for test 10, but the drop was small. The 3.3V rail did sit a little on the high side for most of the testing, but the upper limit is 3.465V, and it was still well within that. The voltage on the 12V rail did drop somewhat more than the other rails as the load went up, but it stayed well within tolerances at all times. The ripple suppression was another pleasant surprise. It never exceeded half the maximum limit on any of the rails until the overload test, where the 12V rail was at 67.4mV, but that’s still well within the allowed 120mV. The efficiency was also very good, staying above 86% until it was under maximum load. It took a bit of a nose dive for the overload test, but at almost 84%, it was still fair.